express + nginx 项目配置问题

express + nginx 项目，代码上线后，单独访问接口是可以的，但是在前端项目中调接口的时候就报 405 ，有大哥知道这是怎么回事吗？ nginx 配置如下：

server {
	listen 80;
    listen 443 ssl;
    server_name xxx;

    ssl_certificate /usr/local/nginx/conf/ssl/xxx.com.pem;
    ssl_certificate_key /usr/local/nginx/conf/ssl/xxx.com.key;

    ssl_protocols TLSv1.2;
    ssl_ciphers HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;

    location / {
        proxy_pass http://127.0.0.1:3000;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    	proxy_set_header X-Real-IP $remote_addr;
    	proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header X-NginX-Proxy true;
   		proxy_set_header Upgrade $http_upgrade;
    	proxy_set_header Connection "upgrade";
    	proxy_set_header X-Forwarded-Proto $scheme;
 		proxy_set_header X-Forwarded-Method $request_method;

		add_header 'Access-Control-Allow-Origin' '*';
  		add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
  		add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
 		add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';

    }
}

前端项目配置了跨域，代码如下：

import { defineConfig } from "vite";

export default defineConfig({
  ...
  server: {
    open: true,
    proxy: {
      "/api": {
        target: nginx 中配置的 server_name ，
        changeOrigin: true,
      },
    },
  },
 ...
});

请各位大哥指点一下